2557385 has 4 divisors (see below), whose sum is σ = 3068868. Its totient is φ = 2045904.

The previous prime is 2557369. The next prime is 2557397. The reversal of 2557385 is 5837552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1923769 + 633616 = 1387^2 + 796^2 .

It is a cyclic number.

It is not a de Polignac number, because 2557385 - 2⁴ = 2557369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255734 + ... + 255743.

It is an arithmetic number, because the mean of its divisors is an integer number (767217).

2^2557385 is an apocalyptic number.

It is an amenable number.

2557385 is a deficient number, since it is larger than the sum of its proper divisors (511483).

2557385 is an equidigital number, since it uses as much as digits as its factorization.

2557385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511482.

The product of its digits is 42000, while the sum is 35.

The square root of 2557385 is about 1599.1826037073. The cubic root of 2557385 is about 136.7514808329.

The spelling of 2557385 in words is "two million, five hundred fifty-seven thousand, three hundred eighty-five".